from typing import List, Tuple, Dict, Mapping, Union, Optional

var: List[int or float] = [5, 2, 4, "a"]
print(var)
student: Tuple[str, int, float, bool] = ("Ben", 5, 1.0, True)


def size(rect: Mapping[str, int]) -> Optional[Dict]:
    return {"width": rect["width"] + 100, "height": rect["height"] + 100}
